Nikon D500 Manuel D’Utilisation

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If Optical AWL or Optical/radio AWL 
is selected for Flash control 
Wireless flash options in the photo 
shooting menu (
channel for the master flash. If the 
remote flash units include an SB-500, 
you must choose channel 3, but 
otherwise you can choose any channel between 1 and 4.
3
f: Set the channel (optical AWL only).
Set the remote flash units to the channel selected in Step 2.
4
f: Group the remote flash units.
Optical AWL
Choose a group (A, B, or C, or if you are using an SB-500 
master flash, A or B) for each remote flash unit. Although 
there is no limit on the number of remote flash units that may 
be used, the practical maximum is three per group. With 
more than this number, the light emitted by the remote flash 
units will interfere with performance.
Radio AWL
Choose a group (A–F) for each of the remote flash units. The 
master flash can control up to 18 flash units in any 
combination.